08-11-2012, 05:01 PM
ELECTRIC DRIVES
[attachment=38630]
Components in electric drives
Motors
DC motors - permanent magnet – wound field
AC motors – induction, synchronous (IPMSM, SMPSM), brushless DC
Applications, cost, environment
Power sources
DC – batteries, fuel cell, photovoltaic - unregulated
AC – Single- three- phase utility, wind generator - unregulated
Control unit
Complexity depends on performance requirement
analog- noisy, inflexible, ideally has infinite bandwidth.
digital – immune to noise, configurable, bandwidth is smaller than the analog controller’s
DSP/microprocessor – flexible, lower bandwidth - DSPs perform faster operation than microprocessors (multiplication in single cycle), can perform complex estimations
Overview of AC and DC drives
AC motors for fixed speed applications
DC motors for variable speed applications
[attachment=38630]
Components in electric drives
Motors
DC motors - permanent magnet – wound field
AC motors – induction, synchronous (IPMSM, SMPSM), brushless DC
Applications, cost, environment
Power sources
DC – batteries, fuel cell, photovoltaic - unregulated
AC – Single- three- phase utility, wind generator - unregulated
Control unit
Complexity depends on performance requirement
analog- noisy, inflexible, ideally has infinite bandwidth.
digital – immune to noise, configurable, bandwidth is smaller than the analog controller’s
DSP/microprocessor – flexible, lower bandwidth - DSPs perform faster operation than microprocessors (multiplication in single cycle), can perform complex estimations
Overview of AC and DC drives
AC motors for fixed speed applications
DC motors for variable speed applications